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react/no-deriving-state-in-effects Perf

作用

禁止在 effect 中从状态派生值并将其存回状态;派生值应在渲染期间计算。

由 React Compiler 提供支持,该编译器会针对每个文件运行一次,并与其他 React Compiler 规则共享。移植自 react-hooks/no-deriving-state-in-effects

为什么这是不好的做法?

在 effect 中派生状态会导致每次更新都额外进行一次渲染,并使派生副本与其来源失去同步。

示例

此规则的错误代码示例:

jsx
import { useEffect, useState } from "react";
function Component() {
  const [firstName] = useState("Taylor");
  const [lastName] = useState("Swift");
  const [fullName, setFullName] = useState("");
  useEffect(() => {
    setFullName(firstName + " " + lastName);
  }, [firstName, lastName]);
  return <div>{fullName}</div>;
}

此规则的正确代码示例:

jsx
function Component({ firstName, lastName }) {
  const fullName = firstName + " " + lastName;
  return <div>{fullName}</div>;
}

使用方法

To enable this rule using the config file or in the CLI, you can use:

json
{
  "plugins": ["react"],
  "rules": {
    "react/no-deriving-state-in-effects": "error"
  }
}
ts
import { defineConfig } from "oxlint";

export default defineConfig({
  plugins: ["react"],
  rules: {
    "react/no-deriving-state-in-effects": "error",
  },
});
bash
oxlint --deny react/no-deriving-state-in-effects --react-plugin

版本

此规则在 vnext 中添加。

参考资料